A bustling car-filled street by day and a 1,500-foot pedestrian promenade on weekend nights, Sai Yeung Choi Street South in the dense neighborhood of Mong Kok was the stage upon which urban life in Hong Kong played out – markets, music, dancing, protests, parties. Clashes with police. Noise. So much noise, in fact, that after 1,200 complaints in a single year, the district council decided to end the street’s 18-year...